期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 71, 期 2, 页码 527-534出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.60583
关键词
Arabidopsis thaliana; circadian rhythm; light signaling; plant clock; pseudo-response regulator
Every member of a small family of PSEUDO-RESPONSE REGULATOR (PRR) genes, including TIMING OF CAB EXPRESSION 1 (TOC1 [or PRR1]), are believed to play roles close to the circadian clock in the model higher plant Arabidopsis thaliana. In this study we established a transgenic line that misexpresses (or overexpresses) the PRR7 gene. As compared with wildtype plants, the resulting PRR7-misexpressing plants (designated PRR7-ox) showed characteristic phenotypes as to hallmarked circadian-associated biological events: (i) early flowering in a manner independent of photoperiodicity, (ii) hypersensitive response to red light during early photomorphogenesis, and (iii) altered free-running rhythms with long period of clock-associated genes. Finally, a series of all transgenic lines (PRR1-ox, PRR3-ox, PRR5-ox, PRR7-ox, and PRR9-ox) were characterized comparatively with regard to their clock-associated roles. The results suggested that the five homologous PRR factors play coordinate roles, distinctively from one another, and closely to the circadian clock in higher plants.
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